Here are the answers to the April 1, 2021 edition of TPO's Exam Study Guide:

1. Even though there are many ways to determine wasting amounts, what is the main purpose of wasting?
The answer to the question is D. One of the best ways to have successful process control is to have proper wasting procedures and calculations. By wasting, you maintain control of your F/M levels and MCRT or sludge ages. There are many ways to waste. Each, when correctly performed, will achieve a sludge age that produces the best effluent possible for your treatment system. One rule of thumb is generally accepted: You should never vary your wasting amount more than 10-15% on a daily basis. This will allow you to make changes without shocking your system.

2. The Lead and Copper Rule revision requires the __________ liter of water to be collected when the sample location has a known lead service line.
The correct answer is B. The recent revisions to the Lead and Copper Rule are the first major changes since the original Lead and Copper Rule of 1991. The updated rule provides an opportunity to further reduce lead and copper contamination from public water supplies. One of the many updates is the required fifth-liter collection of water from a sample location with a known lead service line. The fifth liter of water collected is more likely to be the water that was sitting stagnant in the service line whereas the first-liter sample would represent the stagnant water within the premise plumbing. 



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